/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.portlets.dynamicskin;

/**
 * Interface for classes used to generate a unique token for a dynamic skin using the {@link
 * DynamicSkinInstanceData}. The purpose of the generated token is for it to be used to uniquely
 * name the skin less and css files and to determine when LESS recompilation is needed due to the
 * token value being stale.
 */
public interface DynamicSkinUniqueTokenGenerator {

    /**
     * Generates and returns the token.
     *
     * @param data current skin instance data
     * @return unique token for current skin instance
     */
    String generateToken(final DynamicSkinInstanceData data);
}
